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Kinda of. one very important thing everyone overlooks when talking about web standards, is that they are written by Advertise vendors. Mozilla was the only W3c contributor that was mostly isolated from that conflict, and it was only a single degree! You can continue to ignore, but please, try to deny if you can before down voting.

The backends are either cloud controlled (hence associated with your subscription) or device controlled (associated with the serial number, purchase, drm... ignore your fancy key, everyone will use the TPM in their laptop/phone). And yes, All protocols have similar restrictions to hide information from one side and another (publisher, relying party, etc) but none are better than the isolation you get today with same-origin. And those were put in place by the same advertisers, so it will not be a problem either.